STEREO Weekly Meeting Minutes for 2009-03-03 (Week 10) ANNOUNCEMENTS ------------- * None. INSTRUMENT AND SPACECRAFT STATUS -------------------------------- * All subsystems on both spacecraft are nominal, except that the Ahead spacecraft is currently operating on IMU #2. * Behind is also operating on IMU #2 for testing. DISCUSSION AND OPERATIONS CONSTRAINTS ------------------------------------- Week 09 * On day 55 (Feb 24), during the station 54 track on Ahead, telemetry lock was lost twice for a total of 43 minutes because of weak signal. This resulted in the loss of some SSR data. * The redundant IMU #2 on Behind was powered up on day 55 (Feb 24). After two days of monitoring, the spacecraft was then switched over to IMU #2 on day 57 (Feb 26), and IMU #1 was switched off. So far, the redundant IMU is performing nominally. * The average daily downlink was 6.7 gigabits on Ahead, and 7.0 gigabits on Behind. Week 10 * There have been a number of schedule changes during the week. One reason for the changes is that station 25 went down. For Behind this has been mainly covered by switching to station 26. However, there have been significant track changes for Ahead. Tomorrow's track is 3 hours long. DSN reports that station 25 is fixed now, and STEREO can schedule additional tracks for today and tomorrow if needed. * The other item affecting the STEREO DSN schedule is the Kepler launch. Kepler's launch date slipped from Friday to Saturday (UT). Two extra contingency tracks, earlier than the normal tracks, have been added to the Behind schedule in case Kepler's launch date slips. Autonomy rules have been implemented to manage the SSR pointers properly for either contingency. * Daily savings time begins on Mar 8. Week 11 * A SECCHI stepped calibration roll will be carried out on Ahead on day 69 (Mar 10), starting at 01:20 UT. This is the midpoint roll. The track later on may be shortened to 2.5 hours if the Kepler launch slips. APL still has a chance to modify the schedule for this day in case of launch slip. Otherwise, the calibration roll data would be kept on the recorder, but later data might be lost. * A momentum dump is scheduled for Behind on day 68 (Mar 9) at 20:00 UT. * Behind will be at perihelion on Mar 11. Because Behind just had a calibration roll, the normal perihelion roll will occur in early April. * SWAVES plans to do memory loads on both spacecraft either the week of Mar 9 or Mar 16. It would be best not to do a memory load during the upcoming momentum dump on Ahead on Mar 25. Week 12 * The Herschel sounding rocket is currently scheduled to be launched on Mar 20. Week 13 * A momentum dump is scheduled for Ahead on Mar 25, at 14:30 UT. * If all goes well, Behind will switch back to IMU #1 on Mar 25. Other * The testing of the 180 degree roll maneuvers requested by the SECCHI HI team should be done this week. APL will look into scheduling the rolls as soon as possible, which may be late next week. * The SSC, SECCHI, and SWAVES teams all report that data transfers from the SDS have been running extremely slowly for the last few days. APL will investigate the problem. COORDINATED OBSERVATIONS ------------------------ ------------------------------------------------------------------------------- Scheduled activities for Week 10: M Mar 02 (061) T Mar 03 (062) W Mar 04 (063) T Mar 05 (064) ICAL1, 13:00 UT F Mar 06 (065) S Mar 07 (066) S Mar 08 (067) ------------------------------------------------------------------------------- Scheduled activities for Week 11: M Mar 09 (068) Behind: Momentum dump, 20 UT T Mar 10 (069) Ahead: SECCHI stepped calibration roll, 01:20 UT W Mar 11 (070) T Mar 12 (071) F Mar 13 (072) S Mar 14 (073) S Mar 15 (074) ------------------------------------------------------------------------------- Scheduled activities for Week 12: M Mar 16 (075) T Mar 17 (076) W Mar 18 (077) T Mar 19 (078) F Mar 20 (079) ICAL 14, Herschel sounding rocket launch (TBC) S Mar 21 (080) S Mar 22 (081) Notes * ICAL14, Herschel sounding rocket launch http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf ------------------------------------------------------------------------------- Scheduled activities for Week 13: M Mar 23 (082) T Mar 24 (083) W Mar 25 (084) Ahead: momentum dump, 14:30 UT Behind: Switch back to IMU #1 T Mar 26 (085) F Mar 27 (086) S Mar 28 (087) S Mar 29 (088) ------------------------------------------------------------------------------- Upcoming events: 2009: ICAL-001: Mar 2-6, Apr 6-10, May 11-22, Jun 15-19, Jul 13-17, Aug 17-21 SECCHI Stepped calibration rolls Ahead: Mar 10, Jun 9, Sep 2, Nov 24 Behind: Apr 7, Jun 16, Sep 22, Dec 22 * Feb/Mar (TBC) JOP 216, Multi-wavelength Observations of Oscillations in Polar Plumes * Mar 20 (TBC) ICAL14, Herschel sounding rocket launch http://sohowww.nascom.nasa.gov/soc/JOPs/ical014-draft.pdf * Late March Behind: Switch back to IMU1 * Mar 27, Apr 2 JOP 80, EIT shutterless * Apr 15-29 SUMER campaign, JOPS 178,195,207,210,214,215,217,218,219 http://www.mps.mpg.de/services/campaignplanner/planning/campaign-200904/ Contact Davina Innes-Markiewicz for access * Apr 16 SUMI sounding rocket launch http://adsabs.harvard.edu/abs/2008AGUSMSP51B..01A * May 11 Both: Begin 6 hour daily DSN tracks * May 18 Ahead: Switch downlink rate to 360 kbps * Jun 1-Jul 10 Sunrise 5-day balloon flight http://star.mpae.gwdg.de/Sunrise/project/publicat/SPIE_2004.pdf * Jun 8 Behind: Switch downlink rate to 360 kbps * Jul 1 Both: HGA calibration * Jul 22 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2009/TSE2009.html * Aug 3 Both: Begin 7 hour daily DSN tracks * Aug 10 Ahead: Switch downlink rate to 240 kbps * Aug 31 Behind: Switch downlink rate to 240 kbps * Sep 10 Ahead at L4 Lagrange point * Sep 29 Messenger - Mercury fly-by * Oct 26 Behind at L5 Lagrange point * Nov 1-Dec 15 SUMER campaign (TBC) * Dec 7 Behind: Begin 8 hour daily DSN tracks * Dec 14 Behind: Switch downlink rate to 160 kbps 2010: SECCHI Stepped calibration rolls Ahead: Feb 23, May 18, Aug 10, Nov 2 Behind: Apr 6, Jul 13, Oct 12 * Jan 6 Both: HGA calibration * Apr 19 Ahead: Begin 8 hour daily DSN tracks * Apr 26 Ahead: Switch downlink rate to 160 kbps * Jul 11 Total solar eclipse http://eclipse.gsfc.nasa.gov/SEmono/TSE2010/TSE2010.html * Jul 14 Both: HGA calibration * Nov 15 Behind: Switch downlink rate to 120 kbps 2011: * Jan 12 Both: HGA calibration * Mar 18 Messenger - Mercury orbital insertion * Apr 11 Ahead: Switch downlink rate to 120 kbps * Jul 13 Both: HGA calibration * Aug DAWN - Vesta arrival * Sep 19 Behind: Switch downlink rate to 96 kbps * Sep 26 Ahead: Switch downlink rate to 96 kbps 2012: * Jan 11 Both: HGA calibration * May DAWN - Vesta departure * Jul 11 Both: HGA calibration * Aug Both: Switch downlink rate to 30 kbps 2013: 2014: 2015: * Feb DAWN - Ceres arrival * Jan 10 - Apr 12 Behind: Spacecraft behind Sun * Feb 17 - Aug 2 Ahead: Spacecraft behind Sun * Jul 23 - Nov 10 Behind: Spacecraft behind Sun * Jul DAWN - End of nominal mission